Too many concurrent SMTP connections; please try again later." ?
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"Too many concurrent SMTP connections; please try again later." ?

It means the server your sending through is busy and you probably don't have SMTP Authentication enabled.

Islandnet.com has a pool of connections reserved for customers and then the rest of the connections are available to others who have received email from us white listing the IP address for a short period.

Enabling SMTP Authentication and using your account credentials will make sure that you are allocated one of the reserved connections minimizing the possibility of seeing this message

Note: There will be a time when we make SMTP Authentication a requirement so we advise all customers enable this feature when sending mail through us.